The number of T-shirts that a T-shirt company sells can be modeled by the equation y = 218x + 520, where the price of a T-shirt is represented by x. If they sell their T-shirts for $8 each, how many T-shirts will they sell?

Last month, leonhard euler's watch kiosk at the mall had total sales of $9,489. merchandise totaling $225 was returned. the goods that were sold cost leonhard euler's $5,481. operating expenses for the moth were $992. what was the gross profit on sales?